Dawn dish soap and about 1 cup of water to 2 tablespoons of dawn. Put in sprayer bottle.
Linda....Spectrum is good for Knockouts and Japanese beetles..helped mine and would probably be fine for yours. (Lowe's)
That works great on all bushes.
Soap Spray – Mix ½ teaspoon mild dish soap and 1 teaspoon cooking oil in a 1-quart sprayer filled with water. Spray liberally over entire plant. Bring in Ladybugs – To keep aphids in check, release ladybugs on the affected plant. They will stay as long as there is shelter and host bugs to feed on.
Hi Linda: Nope, you can't go wrong with the soap spray. Be sure to spray the tops and bottoms of your plants leaves and the stems. Heck, to the whole bush! Good luck
Hi Linda, it is likely aphids, this video may help you